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[Hardness Requirements]
⒈Tubes shall have a hardness number not exceeding the values shown for the grade in Table 2.
⒉For tubing less than 0.065 in.[1.65 mm] in wall thickness,it is permissible to use the Rockwell superficial hardness test or the Vickers hardness test. When the Vickers of Table 2 will apply.The superficial hardness number for Grade TPXM-29 and S20153 tubes shall not exceed 80 on the 30T scale or 92 on the 15 T scale.The hardness number for Grades TPXM-10,TPXM-11,and TPXM-19 tubes shall not exceed 46 on the 30 N scale or 73 on the 15 N scale.The hardness number for S20100 and S31254 shall not exceed 79 ob the 30 T scale or 91 on the 15 T scale.Tubes made from all other gardes shall not exceed 74 on the 30 T scale or 88 on the 15 T scale.The hardness for S31655 shall not exceed 81 on the 30 T scale or 92 on the 15 T scale.Tubes made from all other gardes shall not exceed 74 on the 30 T scale or 88 on the 15 T scale.
3.The hardness test shall not be required on tubes smaller than 1/4 in.[6.4 mm] in inside diameter or tubes having a wall thickness thinner than 0.020 in.[0.51 mm].Smaller or thinner tubes should be tension tested only,in accordance with Specification A632.
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